63-66 a body ac options

Has anyone here actually bought an aftermarket air set up for their 63-66 a body and sucsessfully installed it?

My car is all apart and I’m at final paint next week. With the car completely apart the dash is not in it. It was originally a non ac car with center console. I would like to do a re popped mark IV unit but I believe it will not fit with the console and floor shift. Next option is not to install a factory heat box and go with a aftermarket heat box with ac and hide the new controls. With that small and tight dash- what one fits under the dash? Fabrication and holes are part of the deal but size wise I’m not sure if stuffing 5lbs of stuff in a 2lbs bag is worth the energy.
I don’t really want a factory ac set up as parts tomorrow may not be available.
Thanks
Joe